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sndfilesource.cc

/*
    Copyright (C) 2006 Paul Davis 

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#include <cstring>
#include <cerrno>
#include <climits>
#include <cstdarg>

#include <pwd.h>
#include <sys/utsname.h>
#include <sys/stat.h>

#include <glibmm/miscutils.h>
#include <pbd/stacktrace.h>

#include <ardour/sndfilesource.h>
#include <ardour/sndfile_helpers.h>
#include <ardour/utils.h>
#include <ardour/version.h>

#include "i18n.h"

using namespace std;
using namespace ARDOUR;
using namespace PBD;
using Glib::ustring;

gain_t* SndFileSource::out_coefficient = 0;
gain_t* SndFileSource::in_coefficient = 0;
nframes_t SndFileSource::xfade_frames = 64;
const AudioFileSource::Flag SndFileSource::default_writable_flags = AudioFileSource::Flag (AudioFileSource::Writable|
                                                                     AudioFileSource::Removable|
                                                                     AudioFileSource::RemovableIfEmpty|
                                                                     AudioFileSource::CanRename);

static void
snprintf_bounded_null_filled (char* target, size_t target_size, const char* fmt, ...)
{
      char buf[target_size+1];
      va_list ap;

      va_start (ap, fmt);
      vsnprintf (buf, target_size+1, fmt, ap);
      va_end (ap);

      memset (target, 0, target_size);
      memcpy (target, buf, target_size);

}

SndFileSource::SndFileSource (Session& s, const XMLNode& node)
      : AudioFileSource (s, node)
{
      init ();

      if (open()) {
            throw failed_constructor ();
      }
}

SndFileSource::SndFileSource (Session& s, ustring path, int chn, Flag flags)
          /* files created this way are never writable or removable */
      : AudioFileSource (s, path, Flag (flags & ~(Writable|Removable|RemovableIfEmpty|RemoveAtDestroy)))
{
      _channel = chn;

      init ();

      if (open()) {
            throw failed_constructor ();
      }
}

SndFileSource::SndFileSource (Session& s, ustring path, SampleFormat sfmt, HeaderFormat hf, nframes_t rate, Flag flags)
      : AudioFileSource (s, path, flags, sfmt, hf)
{
      int fmt = 0;

      init ();

      /* this constructor is used to construct new files, not open
         existing ones.
      */

      file_is_new = true;

      switch (hf) {
      case CAF:
            fmt = SF_FORMAT_CAF;
            _flags = Flag (_flags & ~Broadcast);
            break;

      case AIFF:
            fmt = SF_FORMAT_AIFF;
            _flags = Flag (_flags & ~Broadcast);
            break;

      case BWF:
            fmt = SF_FORMAT_WAV;
            _flags = Flag (_flags | Broadcast);
            break;

      case WAVE:
            fmt = SF_FORMAT_WAV;
            _flags = Flag (_flags & ~Broadcast);
            break;

      case WAVE64:
            fmt = SF_FORMAT_W64;
            _flags = Flag (_flags & ~Broadcast);
            break;

      default:
            fatal << string_compose (_("programming error: %1"), X_("unsupported audio header format requested")) << endmsg;
            /*NOTREACHED*/
            break;

      }

      switch (sfmt) {
      case FormatFloat:
            fmt |= SF_FORMAT_FLOAT;
            break;

      case FormatInt24:
            fmt |= SF_FORMAT_PCM_24;
            break;

      case FormatInt16:
            fmt |= SF_FORMAT_PCM_16;
            break;
      }
      
      _info.channels = 1;
      _info.samplerate = rate;
      _info.format = fmt;

      if (open()) {
            throw failed_constructor();
      }

      if (writable() && (_flags & Broadcast)) {

            if (!_broadcast_info) {
                  _broadcast_info = new SF_BROADCAST_INFO;
                  memset (_broadcast_info, 0, sizeof (*_broadcast_info));
            }
            
            snprintf_bounded_null_filled (_broadcast_info->description, sizeof (_broadcast_info->description), "BWF %s", _name.c_str());
            snprintf_bounded_null_filled (_broadcast_info->originator, sizeof (_broadcast_info->originator), "ardour %d.%d.%d %s", 
                                    libardour2_major_version,
                                    libardour2_minor_version,
                                    libardour2_micro_version,
                                    Glib::get_real_name().c_str());
            
            _broadcast_info->version = 1;  
            _broadcast_info->time_reference_low = 0;  
            _broadcast_info->time_reference_high = 0;  
            
            /* XXX do something about this field */
            
            snprintf_bounded_null_filled (_broadcast_info->umid, sizeof (_broadcast_info->umid), "%s", "fnord");
            
            /* coding history is added by libsndfile */

            if (sf_command (sf, SFC_SET_BROADCAST_INFO, _broadcast_info, sizeof (*_broadcast_info)) != SF_TRUE) {
                  char errbuf[256];
                  sf_error_str (0, errbuf, sizeof (errbuf) - 1);
                  error << string_compose (_("cannot set broadcast info for audio file %1 (%2); dropping broadcast info for this file"), _path, errbuf) << endmsg;
                  _flags = Flag (_flags & ~Broadcast);
                  delete _broadcast_info;
                  _broadcast_info = 0;
            } 
      } 
}

void 
SndFileSource::init ()
{
      ustring file;

      // lets try to keep the object initalizations here at the top
      xfade_buf = 0;
      sf = 0;
      _broadcast_info = 0;

      if (is_embedded()) {
            _name = _path;
      } else {
            _name = Glib::path_get_basename (_path);
      }

      /* although libsndfile says we don't need to set this,
         valgrind and source code shows us that we do.
      */

      memset (&_info, 0, sizeof(_info));

      _capture_start = false;
      _capture_end = false;
      file_pos = 0;

      if (destructive()) {    
            xfade_buf = new Sample[xfade_frames];
            timeline_position = header_position_offset;
      }

      AudioFileSource::HeaderPositionOffsetChanged.connect (mem_fun (*this, &SndFileSource::handle_header_position_change));
}

int
SndFileSource::open ()
{
      if ((sf = sf_open (_path.c_str(), (writable() ? SFM_RDWR : SFM_READ), &_info)) == 0) {
            char errbuf[256];
            sf_error_str (0, errbuf, sizeof (errbuf) - 1);
#ifndef HAVE_COREAUDIO
            /* if we have CoreAudio, we will be falling back to that if libsndfile fails,
               so we don't want to see this message.
            */

            error << string_compose(_("SndFileSource: cannot open file \"%1\" for %2 (%3)"), 
                              _path, (writable() ? "read+write" : "reading"), errbuf) << endmsg;
#endif
            return -1;
      }

      if (_channel >= _info.channels) {
#ifndef HAVE_COREAUDIO
            error << string_compose(_("SndFileSource: file only contains %1 channels; %2 is invalid as a channel number"), _info.channels, _channel) << endmsg;
#endif
            sf_close (sf);
            sf = 0;
            return -1;
      }

      _length = _info.frames;

      if (!_broadcast_info) {
            _broadcast_info = new SF_BROADCAST_INFO;
            memset (_broadcast_info, 0, sizeof (*_broadcast_info));
      }
      
      bool timecode_info_exists;

      set_timeline_position (get_timecode_info (sf, _broadcast_info, timecode_info_exists));

      if (_length != 0 && !timecode_info_exists) {
            delete _broadcast_info;
            _broadcast_info = 0;
            _flags = Flag (_flags & ~Broadcast);
      }

      if (writable()) {
            sf_command (sf, SFC_SET_UPDATE_HEADER_AUTO, 0, SF_FALSE);
      }

      return 0;
}

SndFileSource::~SndFileSource ()
{
      GoingAway (); /* EMIT SIGNAL */

      if (sf) {
            sf_close (sf);
            sf = 0;

            /* stupid libsndfile updated the headers on close,
               so touch the peakfile if it exists and has data
               to make sure its time is as new as the audio
               file.
            */

            touch_peakfile ();
      }

      if (_broadcast_info) {
            delete _broadcast_info;
      }

      if (xfade_buf) {
            delete [] xfade_buf;
      }
}

float
SndFileSource::sample_rate () const 
{
      return _info.samplerate;
}

nframes_t
SndFileSource::read_unlocked (Sample *dst, nframes_t start, nframes_t cnt) const
{
      int32_t nread;
      float *ptr;
      uint32_t real_cnt;
      nframes_t file_cnt;

      if (start > _length) {

            /* read starts beyond end of data, just memset to zero */
            
            file_cnt = 0;

      } else if (start + cnt > _length) {
            
            /* read ends beyond end of data, read some, memset the rest */
            
            file_cnt = _length - start;

      } else {
            
            /* read is entirely within data */

            file_cnt = cnt;
      }
      
      if (file_cnt != cnt) {
            nframes_t delta = cnt - file_cnt;
            memset (dst+file_cnt, 0, sizeof (Sample) * delta);
      }

      if (file_cnt) {

            if (sf_seek (sf, (sf_count_t) start, SEEK_SET|SFM_READ) != (sf_count_t) start) {
                  char errbuf[256];
                  sf_error_str (0, errbuf, sizeof (errbuf) - 1);
                  error << string_compose(_("SndFileSource: could not seek to frame %1 within %2 (%3)"), start, _name.substr (1), errbuf) << endmsg;
                  return 0;
            }
            
            if (_info.channels == 1) {
                  nframes_t ret = sf_read_float (sf, dst, file_cnt);
                  _read_data_count = ret * sizeof(float);
                  if (ret != file_cnt) {
                        char errbuf[256];
                        sf_error_str (0, errbuf, sizeof (errbuf) - 1);
                        cerr << string_compose(_("SndFileSource: @ %1 could not read %2 within %3 (%4) (len = %5)"), start, file_cnt, _name.substr (1), errbuf, _length) << endl;
                  }
                  return ret;
            }
      }

      real_cnt = cnt * _info.channels;

      Sample* interleave_buf = get_interleave_buffer (real_cnt);
      
      nread = sf_read_float (sf, interleave_buf, real_cnt);
      ptr = interleave_buf + _channel;
      nread /= _info.channels;
      
      /* stride through the interleaved data */
      
      for (int32_t n = 0; n < nread; ++n) {
            dst[n] = *ptr;
            ptr += _info.channels;
      }

      _read_data_count = cnt * sizeof(float);
            
      return nread;
}

nframes_t 
SndFileSource::write_unlocked (Sample *data, nframes_t cnt)
{
      if (destructive()) {
            return destructive_write_unlocked (data, cnt);
      } else {
            return nondestructive_write_unlocked (data, cnt);
      }
}

nframes_t 
SndFileSource::nondestructive_write_unlocked (Sample *data, nframes_t cnt)
{
      if (!writable()) {
            warning << string_compose (_("attempt to write a non-writable audio file source (%1)"), _path) << endmsg;
            return 0;
      }

      if (_info.channels != 1) {
            fatal << string_compose (_("programming error: %1 %2"), X_("SndFileSource::write called on non-mono file"), _path) << endmsg;
            /*NOTREACHED*/
            return 0;
      }
      
      nframes_t oldlen;
      int32_t frame_pos = _length;

      if (write_float (data, frame_pos, cnt) != cnt) {
            return 0;
      }

      oldlen = _length;
      update_length (oldlen, cnt);

      if (_build_peakfiles) {
            compute_and_write_peaks (data, frame_pos, cnt, false, true);
      }

      _write_data_count = cnt;

      return cnt;
}

nframes_t
SndFileSource::destructive_write_unlocked (Sample* data, nframes_t cnt)
{
      nframes_t old_file_pos;

      if (!writable()) {
            warning << string_compose (_("attempt to write a non-writable audio file source (%1)"), _path) << endmsg;
            return 0;
      }

      if (_capture_start && _capture_end) {

            /* start and end of capture both occur within the data we are writing,
               so do both crossfades.
            */

            _capture_start = false;
            _capture_end = false;
            
            /* move to the correct location place */
            file_pos = capture_start_frame - timeline_position;
            
            // split cnt in half
            nframes_t subcnt = cnt / 2;
            nframes_t ofilepos = file_pos;
            
            // fade in
            if (crossfade (data, subcnt, 1) != subcnt) {
                  return 0;
            }
            
            file_pos += subcnt;
            Sample * tmpdata = data + subcnt;
            
            // fade out
            subcnt = cnt - subcnt;
            if (crossfade (tmpdata, subcnt, 0) != subcnt) {
                  return 0;
            }
            
            file_pos = ofilepos; // adjusted below

      } else if (_capture_start) {

            /* start of capture both occur within the data we are writing,
               so do the fade in
            */

            _capture_start = false;
            _capture_end = false;
            
            /* move to the correct location place */
            file_pos = capture_start_frame - timeline_position;

            if (crossfade (data, cnt, 1) != cnt) {
                  return 0;
            }
            
      } else if (_capture_end) {

            /* end of capture both occur within the data we are writing,
               so do the fade out
            */

            _capture_start = false;
            _capture_end = false;
            
            if (crossfade (data, cnt, 0) != cnt) {
                  return 0;
            }

      } else {

            /* in the middle of recording */

            if (write_float (data, file_pos, cnt) != cnt) {
                  return 0;
            }
      }

      old_file_pos = file_pos;
      update_length (file_pos, cnt);

      if (_build_peakfiles) {
            compute_and_write_peaks (data, file_pos, cnt, false, true);
      }

      file_pos += cnt;
      
      return cnt;
}

int
SndFileSource::update_header (nframes_t when, struct tm& now, time_t tnow)
{     
      set_timeline_position (when);

      if (_flags & Broadcast) {
            if (setup_broadcast_info (when, now, tnow)) {
                  return -1;
            }
      } 

      return flush_header ();
}

int
SndFileSource::flush_header ()
{
      if (!writable() || (sf == 0)) {
            warning << string_compose (_("attempt to flush a non-writable audio file source (%1)"), _path) << endmsg;
            return -1;
      }
      return (sf_command (sf, SFC_UPDATE_HEADER_NOW, 0, 0) != SF_TRUE);
}

int
SndFileSource::setup_broadcast_info (nframes_t when, struct tm& now, time_t tnow)
{
      if (!writable()) {
            warning << string_compose (_("attempt to store broadcast info in a non-writable audio file source (%1)"), _path) << endmsg;
            return -1;
      }

      if (!(_flags & Broadcast)) {
            return 0;
      }

      /* random code is 9 digits */
      
      int random_code = random() % 999999999;
      
      snprintf_bounded_null_filled (_broadcast_info->originator_reference, sizeof (_broadcast_info->originator_reference), "%2s%3s%12s%02d%02d%02d%9d",
                              Config->get_bwf_country_code().c_str(),
                              Config->get_bwf_organization_code().c_str(),
                              bwf_serial_number,
                              now.tm_hour,
                              now.tm_min,
                              now.tm_sec,
                              random_code);
      
      snprintf_bounded_null_filled (_broadcast_info->origination_date, sizeof (_broadcast_info->origination_date), "%4d-%02d-%02d",
                              1900 + now.tm_year,
                              now.tm_mon + 1, // shift range from 0..11 to 1..12
                              now.tm_mday);
      
      snprintf_bounded_null_filled (_broadcast_info->origination_time, sizeof (_broadcast_info->origination_time), "%02d:%02d:%02d",
                              now.tm_hour,
                              now.tm_min,
                              now.tm_sec);
      
      /* now update header position taking header offset into account */
      
      set_header_timeline_position ();

      if (sf_command (sf, SFC_SET_BROADCAST_INFO, _broadcast_info, sizeof (*_broadcast_info)) != SF_TRUE) {
            error << string_compose (_("cannot set broadcast info for audio file %1; Dropping broadcast info for this file"), _path) << endmsg;
            _flags = Flag (_flags & ~Broadcast);
            delete _broadcast_info;
            _broadcast_info = 0;
            return -1;
      }

      return 0;
}

void
SndFileSource::set_header_timeline_position ()
{
      if (!(_flags & Broadcast)) {
            return;
      }

       _broadcast_info->time_reference_high = (timeline_position >> 32);
       _broadcast_info->time_reference_low = (timeline_position & 0xffffffff);

      if (sf_command (sf, SFC_SET_BROADCAST_INFO, _broadcast_info, sizeof (*_broadcast_info)) != SF_TRUE) {
            error << string_compose (_("cannot set broadcast info for audio file %1; Dropping broadcast info for this file"), _path) << endmsg;
            _flags = Flag (_flags & ~Broadcast);
            delete _broadcast_info;
            _broadcast_info = 0;
      }
}

nframes_t
SndFileSource::write_float (Sample* data, nframes_t frame_pos, nframes_t cnt)
{
      if (sf_seek (sf, frame_pos, SEEK_SET|SFM_WRITE) < 0) {
            char errbuf[256];
            sf_error_str (0, errbuf, sizeof (errbuf) - 1);
            error << string_compose (_("%1: cannot seek to %2 (libsndfile error: %3"), _path, frame_pos, errbuf) << endmsg;
            return 0;
      }
      
      if (sf_writef_float (sf, data, cnt) != (ssize_t) cnt) {
            return 0;
      }
      
      return cnt;
}

nframes_t
SndFileSource::natural_position() const
{
      return timeline_position;
}

bool
SndFileSource::set_destructive (bool yn)
{
      if (yn) {
            _flags = Flag (_flags | Destructive);
            if (!xfade_buf) {
                  xfade_buf = new Sample[xfade_frames];
            }
            clear_capture_marks ();
            timeline_position = header_position_offset;
      } else {
            _flags = Flag (_flags & ~Destructive);
            timeline_position = 0;
            /* leave xfade buf alone in case we need it again later */
      }

      return true;
}

void
SndFileSource::clear_capture_marks ()
{
      _capture_start = false;
      _capture_end = false;
}     

void
SndFileSource::mark_capture_start (nframes_t pos)
{
      if (destructive()) {
            if (pos < timeline_position) {
                  _capture_start = false;
            } else {
                  _capture_start = true;
                  capture_start_frame = pos;
            }
      }
}

void
SndFileSource::mark_capture_end()
{
      if (destructive()) {
            _capture_end = true;
      }
}

nframes_t
SndFileSource::crossfade (Sample* data, nframes_t cnt, int fade_in)
{
      nframes_t xfade = min (xfade_frames, cnt);
      nframes_t nofade = cnt - xfade;
      Sample* fade_data = 0;
      nframes_t fade_position = 0; // in frames
      ssize_t retval;
      nframes_t file_cnt;

      if (fade_in) {
            fade_position = file_pos;
            fade_data = data;
      } else {
            fade_position = file_pos + nofade;
            fade_data = data + nofade;
      }

      if (fade_position > _length) {
            
            /* read starts beyond end of data, just memset to zero */
            
            file_cnt = 0;

      } else if (fade_position + xfade > _length) {
            
            /* read ends beyond end of data, read some, memset the rest */
            
            file_cnt = _length - fade_position;

      } else {
            
            /* read is entirely within data */

            file_cnt = xfade;
      }

      if (file_cnt) {
            
            if ((retval = read_unlocked (xfade_buf, fade_position, file_cnt)) != (ssize_t) file_cnt) {
                  if (retval >= 0 && errno == EAGAIN) {
                        /* XXX - can we really trust that errno is meaningful here?  yes POSIX, i'm talking to you.
                         * short or no data there */
                        memset (xfade_buf, 0, xfade * sizeof(Sample));
                  } else {
                        error << string_compose(_("SndFileSource: \"%1\" bad read retval: %2 of %5 (%3: %4)"), _path, retval, errno, strerror (errno), xfade) << endmsg;
                        return 0;
                  }
            }
      } 

      if (file_cnt != xfade) {
            nframes_t delta = xfade - file_cnt;
            memset (xfade_buf+file_cnt, 0, sizeof (Sample) * delta);
      }
      
      if (nofade && !fade_in) {
            if (write_float (data, file_pos, nofade) != nofade) {
                  error << string_compose(_("SndFileSource: \"%1\" bad write (%2)"), _path, strerror (errno)) << endmsg;
                  return 0;
            }
      }

      if (xfade == xfade_frames) {

            nframes_t n;

            /* use the standard xfade curve */
            
            if (fade_in) {

                  /* fade new material in */
                  
                  for (n = 0; n < xfade; ++n) {
                        xfade_buf[n] = (xfade_buf[n] * out_coefficient[n]) + (fade_data[n] * in_coefficient[n]);
                  }

            } else {


                  /* fade new material out */
                  
                  for (n = 0; n < xfade; ++n) {
                        xfade_buf[n] = (xfade_buf[n] * in_coefficient[n]) + (fade_data[n] * out_coefficient[n]);
                  }
            }

      } else if (xfade < xfade_frames) {

            gain_t in[xfade];
            gain_t out[xfade];

            /* short xfade, compute custom curve */

            compute_equal_power_fades (xfade, in, out);

            for (nframes_t n = 0; n < xfade; ++n) {
                  xfade_buf[n] = (xfade_buf[n] * out[n]) + (fade_data[n] * in[n]);        
            }

      } else if (xfade) {

            /* long xfade length, has to be computed across several calls */

      }

      if (xfade) {
            if (write_float (xfade_buf, fade_position, xfade) != xfade) {
                  error << string_compose(_("SndFileSource: \"%1\" bad write (%2)"), _path, strerror (errno)) << endmsg;
                  return 0;
            }
      }
      
      if (fade_in && nofade) {
            if (write_float (data + xfade, file_pos + xfade, nofade) != nofade) {
                  error << string_compose(_("SndFileSource: \"%1\" bad write (%2)"), _path, strerror (errno)) << endmsg;
                  return 0;
            }
      }

      return cnt;
}

nframes_t
SndFileSource::last_capture_start_frame () const
{
      if (destructive()) {
            return capture_start_frame;
      } else {
            return 0;
      }
}

void
SndFileSource::handle_header_position_change ()
{
      if (destructive()) {
            if ( _length != 0 ) {
                  error << string_compose(_("Filesource: start time is already set for existing file (%1): Cannot change start time."), _path ) << endmsg;
                  //in the future, pop up a dialog here that allows user to regenerate file with new start offset
            } else if (writable()) {
                  timeline_position = header_position_offset;
                  set_header_timeline_position ();  //this will get flushed if/when the file is recorded to
            }
      }
}

void
SndFileSource::setup_standard_crossfades (nframes_t rate)
{
      /* This static method is assumed to have been called by the Session
         before any DFS's are created.
      */

      xfade_frames = (nframes_t) floor ((Config->get_destructive_xfade_msecs () / 1000.0) * rate);

      if (out_coefficient) {
            delete [] out_coefficient;
      }

      if (in_coefficient) {
            delete [] in_coefficient;
      }

      out_coefficient = new gain_t[xfade_frames];
      in_coefficient = new gain_t[xfade_frames];

      compute_equal_power_fades (xfade_frames, in_coefficient, out_coefficient);
}

void
SndFileSource::set_timeline_position (int64_t pos)
{
      // destructive track timeline postion does not change
      // except at instantion or when header_position_offset 
      // (session start) changes

      if (!destructive()) {
            AudioFileSource::set_timeline_position (pos);
      } 
}

int
SndFileSource::get_soundfile_info (const ustring& path, SoundFileInfo& info, string& error_msg)
{
      SNDFILE *sf;
      SF_INFO sf_info;
      SF_BROADCAST_INFO binfo;
      bool timecode_exists;

      sf_info.format = 0; // libsndfile says to clear this before sf_open().

      if ((sf = sf_open ((char*) path.c_str(), SFM_READ, &sf_info)) == 0) { 
            char errbuf[256];
            error_msg = sf_error_str (0, errbuf, sizeof (errbuf) - 1);
            return false;
      }

      info.samplerate  = sf_info.samplerate;
      info.channels    = sf_info.channels;
      info.length      = sf_info.frames;

      string major = sndfile_major_format(sf_info.format);
      string minor = sndfile_minor_format(sf_info.format);

      if (major.length() + minor.length() < 16) { /* arbitrary */
            info.format_name = string_compose("%1/%2", major, minor);
      } else {
            info.format_name = string_compose("%1\n%2", major, minor);
      }

      memset (&binfo, 0, sizeof (binfo));
      info.timecode  = get_timecode_info (sf, &binfo, timecode_exists);

      if (!timecode_exists) {
            info.timecode = 0;
      }
      
      sf_close (sf);

      return true;
}

int64_t
SndFileSource::get_timecode_info (SNDFILE* sf, SF_BROADCAST_INFO* binfo, bool& exists)
{
      if (sf_command (sf, SFC_GET_BROADCAST_INFO, binfo, sizeof (*binfo)) != SF_TRUE) {
            exists = false;
            return (header_position_offset);
      } 
      
      /* XXX 64 bit alert: when JACK switches to a 64 bit frame count, this needs to use the high bits
         of the time reference.
      */

      exists = true;
      int64_t ret = (uint32_t) binfo->time_reference_high;
      ret <<= 32;
      ret |= (uint32_t) binfo->time_reference_low;
      return ret;
}

bool
SndFileSource::one_of_several_channels () const
{
      return _info.channels > 1;
}


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